Student Exploration Worksheet: Identifying Nutrients

Pages: 4 (784 words) Published: July 28, 2014


Student Exploration: Identifying Nutrients

Vocabulary: carbohydrate, disaccharide, lipid, monosaccharide, polysaccharide, protein, starch

Prior Knowledge Questions (Do these BEFORE using the Gizmo.)

1. What are the major types of nutrients you can get from food? ________________________

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2. How are these nutrients used by your body? _____________________________________

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Gizmo Warm-up
Have you ever wondered what is in your food? Scientists use a variety of tests to determine the nutritional content of food. You will learn four of those tests with the Identifying Nutrients Gizmo™.

1. Below the Food samples label, drag tube A into the Food sample holder. Below the Benedict test, click the Test button. What is done in the Benedict test?

___________________________________________

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2. The Benedict test is a test for monosaccharides; simple sugars like glucose or fructose (fruit sugar). In contact with monosaccharides, the Benedict solution turns from blue to pink.

Does Sample A contain monosaccharides? _________

Note: Disaccharides such as sucrose (table sugar) and lactose (milk sugar) are more complex than monosaccharides. The Benedict test does detect disaccharides directly.

Activity A:

Identifying nutrients
Get the Gizmo ready:
Click Reset.
Drag Sample A into the Food sample holder.

Introduction: Most food is composed of three types of molecules: carbohydrates, proteins, and lipids. Carbohydrates such as starches and sugars are major source of energy. Simple sugars are found in sweets and fruits. Starches...
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